US Patent No: 4,867,793

Number of patents in Portfolio can not be more than 2000

Nacreous pigments

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Abstract

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Platelet-shaped colored pigments in which a platelet-shaped substrate is provided with a compact coating containing iron(II) oxide, which coating has a high gloss and, depending on the layer thickness, shows the interference color of thin platelets, are described.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MERCK PATENT GMBHDARMSTADT1741

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ambrosius, Kalus Frankfurt am Main, DE 1 64
Brucker, Hans D Darmstadt, DE 1 64
Franz, Klaus D Kelheim, DE 5 138
Kanpp, August Dieburg, DE 1 64

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MERCK PATENT GMBH (3)
* 4,435,220 Transparent colored pigments 42 1982
* 4,509,988 Nacreous pigments having improved light fastness, their preparation and use 23 1982
* 4,482,389 Nacreous pigments 20 1983
 
BASF CORPORATION (1)
* 4,618,375 Transparent iron oxide pigments 8 1984
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
JDS UNIPHASE CORPORATION (21)
7,258,915 Flake for covert security applications 6 2003
7,754,112 Methods for forming security articles having diffractive surfaces and color shifting backgrounds 0 2003
7,241,489 Opaque flake for covert security applications 6 2004
7,517,578 Method and apparatus for orienting magnetic flakes 7 2004
7,300,695 Alignable diffractive pigment flakes 8 2005
7,224,528 Optically variable security devices 13 2005
7,645,510 Provision of frames or borders around opaque flakes for covert security applications 2 2005
7,667,895 Patterned structures with optically variable effects 3 2005
7,604,855 Kinematic images formed by orienting alignable flakes 3 2005
8,343,615 Dynamic appearance-changing optical devices (DACOD) printed in a shaped magnetic field including printable fresnel structures 1 2006
7,674,501 Two-step method of coating an article for security printing by application of electric or magnetic field 1 2006
7,625,632 Alignable diffractive pigment flakes and method and apparatus for alignment and images formed therefrom 3 2006
7,876,481 Patterned optical structures with enhanced security feature 2 2006
7,729,026 Security device with metameric features using diffractive pigment flakes 2 2006
7,934,451 Apparatus for orienting magnetic flakes 3 2007
8,118,963 Stamping a coating of cured field aligned special effect flakes and image formed thereby 0 2007
7,550,197 Non-toxic flakes for authentication of pharmaceutical articles 4 2007
7,880,943 Patterned optical structures with enhanced security feature 2 2007
8,025,952 Printed magnetic ink overt security image 1 2007
8,658,280 Taggent flakes for covert security applications having a selected shape 0 2011
8,726,806 Apparatus for orienting magnetic flakes 0 2012
 
MERCK PATENT GMBH (18)
* 5,106,419 Glass-stable colored pigments 5 1991
* 5,354,374 Iron oxide pigments 12 1992
* 5,320,781 Conductive pigment 22 1993
* 6,630,018 Colored and coated plateletlike pigments 30 1994
* 5,472,640 Conductive lamellar pigments 13 1994
* 5,468,289 Surface-modified pigments 6 1994
* 5,759,257 Color pigments 3 1996
6,632,276 Conductive pigments 7 1997
* 6,132,873 Multilayered interference pigments 36 1998
6,689,205 Multilayer interference pigments 32 2000
7,226,503 Effect pigments based on coated glass flakes 13 2002
7,604,862 Multilayer pigments based on glass flakes 2 2002
* 7,241,503 Iridescent pigment having high brilliance and high chroma 10 2003
* 7,611,574 Interference pigment with a high covering power 0 2004
* 7,303,622 Lustrous black interference pigments 9 2004
7,169,222 Multilayer interference pigments 1 2005
8,906,504 Pigments 0 2006
8,658,184 Glass flakes, and the use thereof as transparent filler 0 2007
 
SUN CHEMICAL CORPORATION (9)
* 7,850,775 Multi-colored lustrous pearlescent pigments 4 2007
8,906,154 Coating, ink, or article comprising multi-colored lustrous pearlescent pigments 0 2007
* 8,349,067 Multi-colored lustrous pearlescent pigments 1 2007
8,221,536 Cosmetic comprising multi-colored lustrous pearlescent pigments 1 2007
8,211,224 Multi-colored lustrous pearlescent pigments and process for making 0 2007
8,323,396 Orange pearlescent pigments 1 2008
8,211,225 Magnetic pigments and process of enhancing magnetic properties 0 2008
8,486,189 Cosmetic comprising multi-colored lustrous pearlescent pigments 1 2012
8,409,342 Magnetic pigments and process of enhancing magnetic properties 0 2012
 
BASF AKTIENGESELLSCHAFT (4)
* 5,626,661 Luster pigments based on multiply coated plateletlike silicatic substrates 22 1994
* 5,411,586 Luster pigments containing bismuth vanadate 4 1994
* 5,624,486 Multiply coated metallic luster pigments 97 1994
* 5,573,584 Interference pigments for preparing forgeryproof documents 59 1995
 
ENGELHARD CORPORATION (2)
* 5,326,392 Platy pigments 17 1993
* 6,485,556 Interference pigments 13 2001
 
Nihon Koken Kogyo KK (2)
* 8,016,934 Pearlescent pigment 0 2005
8,153,163 Pearlescent pigment 0 2011
 
BASF CATALYSTS LLC (1)
7,678,449 Iridescent magnetic effect pigments comprising a ferrite layer 6 2006
 
BASF CORPORATION (1)
* 8,728,502 Black effect pigment 0 2012
 
Dri Mark Products, Inc. (1)
6,561,713 Metallic ink composition for wick type writing instruments 15 2002
 
ECKART-WERKE STANDARD BRONZEPULVER- (1)
* 5,931,996 Colored aluminum pigments, process for producing them and their use 28 1997
 
IMMUNOMEDICS, INC. (1)
* 5,601,825 Therapeutic conjugates of toxins and drugs 9 1995
 
INNOVA-GESELLSCHAFT ZUR ENTWICKLUNG VERMARKTUNG INNOVATIVER PRODUKTE M.B.H. (1)
* 6,372,517 Magnetic particles with biologically active receptors 10 1999
 
Nashua Corporation (1)
* 6,107,244 Verification methods employing thermally--imageable substrates 3 1998
 
NOMA HOLDING S.A. (1)
6,695,905 PIGMENTS HAVING A VIEWING ANGLE DEPENDENT SHIFT OF COLOR, METHOD FOR PRODUCING SAID PIGMENTS, USE OF SAID PIGMENTS IN SECURITY APPLICATIONS, COATING COMPOSITION COMPRISING SAID PIGMENTS AND A DETECTING DEVICE 16 2002
 
Other [Check patent profile for assignment information] (1)
* 2012/0237,577 Black Effect Pigment 1 2012
* Cited By Examiner